July 8, 2025: The National High-Speed Rail Corporation Limited (NHSRCL) has announced substantial progress on the Mumbai–Ahmedabad high-speed bullet train corridor, achieving several critical construction and tunnelling milestones in Maharashtra as of Saturday, July 5.
Significant strides have been made on all three elevated station sites in the state—Thane, Virar, and Boisar. The initial slabs for both Virar and Boisar stations have now been cast. Across the alignment, pier foundations and superstructure work are advancing steadily, with approximately 44 kilometres of piers completed to date. Viaduct construction has also commenced in Palghar district, utilising full-span box girder launching technology, beginning in the Dahanu region.
Work is actively progressing on seven mountain tunnels in the Palghar district, illustrating the project’s complex engineering scope. A major highlight is the 21-kilometre underground and undersea tunnel connecting the Bandra-Kurla Complex (BKC) station in Mumbai to Shilphata. Of this, 16 kilometres are being excavated using Tunnel Boring Machines (TBMs), while the remaining 5 kilometres are being executed using the New Austrian Tunnelling Method (NATM). The tunnel includes a 7-kilometre undersea section beneath Thane Creek. Thus far, around 4.1 kilometres of tunnel heading has been achieved via NATM from Shilphata, with dual-face progress from the ADIT portal.
Vertical construction is also proceeding at pace. Base slab casting has been completed at both the 56-metre-deep Vikhroli shaft and the 39-metre-deep Sawli shaft. Sludge treatment plants are being installed at these sites, and segment production is ongoing at the Mahape casting yard for tunnel lining.
Additionally, bridge construction is underway over the Vaitarna, Ulhas, and Jagani rivers. At the Bandra-Kurla Complex station site, 80% of the excavation is complete, and base slab casting has commenced 100 feet below ground level.
Source: Prop News Time